University of Florida

A gnat-sized insect, the Asian citrus psyllid, forced Dean Mixon to replace about 1,000 orange trees in the past two years on the 50-acre Florida farm his grandfather started in the 1930s. The bug spreads a disease called citrus greening.

The probe of Libor manipulation is proving to be the tip of the iceberg as inquiries into assets from derivatives to foreign exchange show that if there’s a chance to rig benchmark rates in world markets, someone is usually willing to try.